JP3894549B2 - Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them - Google Patents

Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them Download PDF

Info

Publication number
JP3894549B2
JP3894549B2 JP2002131517A JP2002131517A JP3894549B2 JP 3894549 B2 JP3894549 B2 JP 3894549B2 JP 2002131517 A JP2002131517 A JP 2002131517A JP 2002131517 A JP2002131517 A JP 2002131517A JP 3894549 B2 JP3894549 B2 JP 3894549B2
Authority
JP
Japan
Prior art keywords
polarizing plate
layer
transflective
reflective
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002131517A
Other languages
Japanese (ja)
Other versions
JP2003172809A (en
Inventor
和孝 原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to JP2002131517A priority Critical patent/JP3894549B2/en
Priority to US10/253,436 priority patent/US6965418B2/en
Priority to TW091122168A priority patent/TW571125B/en
Priority to CNB021434484A priority patent/CN1281978C/en
Priority to KR1020020058407A priority patent/KR100841844B1/en
Publication of JP2003172809A publication Critical patent/JP2003172809A/en
Application granted granted Critical
Publication of JP3894549B2 publication Critical patent/JP3894549B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G02F1/133555—Transflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/22—Antistatic materials or arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Description

【０００１】
【発明が属する技術分野】
本発明は、液晶表示装置（以下、「ＬＣＤ」と略称することがある。）に使用される半透過型偏光板、反射型偏光板及びそれを用いた液晶表示装置に関する。
【０００２】
【従来の技術】
ＬＣＤは、卓上電子計算機、電子時計、パーソナルコンピューター、ワードプロセッサ等に使用され、近年急激にその需要が増加しており、携帯電話や個人携帯情報端末などの半透過反射ディスプレイの伸びが著しい。
【０００３】
従来、ＬＣＤの表示特性を向上させるために、偏光板に半透過反射板を積層してなる半透過型偏光板を、通常液晶セルの裏側に設け、液晶表示装置を比較的明るい雰囲気で使用する場合には、視認側（表示側）からの入射光を反射させて画像を表示し、比較的暗い雰囲気で使用する場合には、半透過型偏光板のバックサイドに内蔵されているバックライト等の内蔵光源を使用して画像を表示する方法が採用されている。即ち、半透過型偏光板は、明るい雰囲気下ではバックライト等の光源使用のエネルギーを節約でき、比較的暗い雰囲気下では内蔵光源を用いて使用できるため、液晶表示装置の形成に有用である。
【０００４】
【発明が解決しようとする課題】
しかしながら、反射板は、樹脂基材に貼り合わせるか又は蒸着・スパッタリングにて成膜され、偏光板等の光学フィルムと貼り合わせて用いられていた。図２は、従来の半透過反射板あるいは反射板の構成例を示す模式断面図である。ＰＥＴなどの樹脂（絶縁体）からなる光透過性高分子基材１１上に、金属薄膜からなる半透過反射層あるいは反射層（導電体）１３が形成され、その層の上に粘着剤層（絶縁体）１４が形成され、半透過反射板あるいは反射板１５を構成している。そのため、絶縁体でサンドイッチされた構造は静電気を保持しやすく、静電気による火災や電気障害を招くおそれがあった。また、製品の性質上、背面側基材には傷防止のために「再剥離性粘着剤付保護シート」（以下、「ＳＰＶ」と略称する）が貼り合わされる場合が多く、基材に界面活性剤を塗布しただけでは、ＳＰＶの貼り合わせ・剥離時に界面活性剤が取れてしまう問題があった。
【０００５】
そこで、本発明は、前記従来の問題を解決するため、ＳＰＶの貼り合わせ・剥離時に取れ難く、そのため静電気が保持され難く電気障害の発生を防止できる半透過型偏光板、反射型偏光板及びそれらを用いた液晶表示装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】
前記の目的を達成するため本発明の半透過型偏光板は、偏光板と、粘着剤層と、光透過性を有する金属蒸着膜又は金属薄膜からなる半透過反射層と、光透過性高分子基材と、表面抵抗値が１０×１０ 10 Ω以下である静電防止層とをこの順番で積層したことを特徴とする。
【０００７】
本発明の半透過型偏光板においては、前記静電防止層が、導電性ポリマーから形成されていることが好ましい。
【０００８】
また、本発明の半透過型偏光板においては、前記静電防止層が、導電性フィラーを添加した樹脂バインダーから形成されていることが好ましい。
【０００９】
また、本発明の半透過型偏光板においては、前記静電防止層の剥離強度が、０．５Ｎ／２５ｍｍ以上であることが好ましい。
【００１０】
また、本発明の半透過型偏光板においては、前記静電防止層の光透過率が、７０％以上であることが好ましい。
【００１１】
また、本発明の半透過型偏光板においては、前記光透過性高分子基材は、ポリエチレンテレフタレートから形成されるのが好ましい。
【００１２】
次に、本発明の反射型偏光板は、偏光板と、粘着剤層と、金属蒸着膜又は金属薄膜からなる反射層と、光透過性高分子基材と、表面抵抗値が１０×１０ 10 Ω以下である静電防止層とをこの順番で積層したことを特徴とする。
【００１３】
本発明の反射型偏光板においては、前記静電防止層が、導電性ポリマーから形成されていることが好ましい。
【００１４】
また、本発明の反射型偏光板においては、前記静電防止層が、導電性フィラーを添加した樹脂バインダーから形成されていることが好ましい。
【００１５】
また、本発明の反射型偏光板においては、前記静電防止層の剥離強度が、０．５Ｎ／２５ｍｍ以上であることが好ましい。
【００１６】
また、本発明の反射型偏光板においては、前記光透過性高分子基材は、ポリエチレンテレフタレートから形成されるのが好ましい。
【００１７】
また、本発明の液晶表示装置は、前記半透過型偏光板又は反射型偏光板を、液晶セルの少なくとも片面に配置したことを特徴とする。この液晶表示装置においては、前記半透過型偏光板又は反射型偏光板は、該半透過型偏光板又は反射型偏光板に形成された静電防止層が、液晶表示装置の表示背面側となるように配置されていることが好ましい。
【００１８】
また、本発明は、本発明の半透過型偏光板の製造方法であって、
前記製造方法は、光透過性を有する金属蒸着膜又は金属薄膜からなる半透過反射層と、光透過性高分子基材との積層体を準備し、
前記積層体の前記光透過性高分子基材上に、表面抵抗値が１０×１０ 10 Ω以下である導電性ポリマーまたは導電性フィラーを含有する導電性塗料を塗布して静電防止層を形成し、
前記積層体の前記半透過反射層上に粘着剤を塗布して粘着剤層を形成し、
前記粘着剤層上に偏光板を積層して半透過型偏光板を得る工程を含むことを特徴とする。
【００１９】
また、本発明は、本発明の反射型偏光板の製造方法であって、
前記製造方法は、金属蒸着膜又は金属薄膜からなる反射層と、光透過性高分子基材との積層体を準備し、
前記積層体の前記光透過性高分子基材上に、表面抵抗値が１０×１０ 10 Ω以下である導電性ポリマーまたは導電性フィラーを含有する導電性塗料を塗布して静電防止層を形成し、
前記積層体の前記反射層上に粘着剤を塗布して粘着剤層を形成し、
前記粘着剤層上に偏光板を積層して反射型偏光板を得る工程を含むことを特徴とする。
【００２０】
【発明の実施の形態】
本発明の半透過型偏光板又は反射型偏光板は、偏光板と、粘着剤層と、光透過性を有する金属蒸着膜又は金属薄膜からなる半透過反射層と、光透過性高分子基材と、表面抵抗値が１０×１０ 10 Ω以下である静電防止層とをこの順番で積層したもの、または、偏光板と、粘着剤層と、金属蒸着膜又は金属薄膜からなる反射層と、光透過性高分子基材と、表面抵抗値が１０×１０ 10 Ω以下である静電防止層とをこの順番で積層したものである。表面抵抗値が１０×１０10Ωより大きい場合は、反射板に静電気が蓄積され易く、静電気による火災や電気障害を招くおそれがあり好ましくないからである。表面抵抗値は、好ましくは１０×１０8Ω以下、より好ましくは１０×１０7Ω以下である。
【００２１】
前記光透過性高分子基材としては、ポリエチレンテルフタレート（ＰＥＴ）、ポリカーボネート（ＰＣ）、ポリエーテルスルホン（ＰＥＳ）、ポリビニルアルコール（ＰＶＡ）、トリアセチルセルロース（ＴＡＣ）等の樹脂が使用できる。その厚さは、特に限定されないが、通常６〜１００μｍである。
【００２２】
半透過反射層又は反射層は、金属蒸着膜又は金属薄膜から形成されてなる。前記金属蒸着膜や金属薄膜に使用できる金属としては、アルミニウム、銀、銀−パラジウム合金、クロム等が挙げられる。
【００２３】
また、前記静電防止層は、前記の特性を満足するものであれば特に限定されないが、ＳＰＶ貼り合わせ又は剥離時の脱落を防止するため、導電性ポリマーや、導電性フィラーを添加した樹脂バインダーからなる導電層が形成されていることが好ましい。半透過反射板においては、静電防止層は、光透過率７０％以上であることが好ましく、さらに好ましくは８０％以上である。静電防止層の厚さは、特に限定されないが、通常０．１〜５０μｍである。
【００２４】
前記導電性ポリマーとしては、特に限定されず、ポリアニリン、ポリアセチレン、及びこれらのポリマーへイオンドープを行った各種ドーピング材等、従来公知の導電性ポリマーを全て使用できる。また、前記導電性フィラーとしては、酸化インジウム、酸化錫、酸化亜鉛、ＡＴＯ（酸化錫アンチモン）等が挙げられる。
【００２５】
静電防止層の形成方法としては、特に限定されず、例えば、導電性ポリマーや導電性フィラーを含有する導電性塗料を、光透過性高分子基材に塗工し、乾燥することにより形成することができる。なお、市販品の導電性塗料を用いることも可能である。
【００２６】
また、静電防止層は、背面側にＥＬバックライトや拡散部材、プリズムシートを直接貼り付け使用する場合に備えて、光透過性高分子基材への密着力を剥離強度として表したときに、その値が０．５Ｎ／２５ｍｍ以上、好ましくは２Ｎ／２５ｍｍ以上、さらに好ましくは５Ｎ／２５ｍｍ以上であることが好ましい。
【００２７】
図１に、本発明の半透過型偏光板に含まれる半透過反射板(又は反射板）の構成例を示す。光透過性高分子基材１上に半透過反射層（又は反射層）３が形成され、その上に粘着剤層４が形成され、光透過性高分子基材１の背面には静電防止層２が形成され、半透過反射板（又は反射板）５を構成している。これを表示装置に実装する場合は、帯電した際に電荷がアース箇所にスムーズに移動でき、静電気の除去が容易に行えるように、半透過反射板（又は反射板）５の静電防止層が表示背面側となるように配置する。
【００２８】
また、本発明の半透過型偏光板は、前記半透過反射板と偏光板を貼り合わせたものであり、反射型偏光板は、前記反射板と偏光板を貼り合わせたものである。なお、貼り合わせには、粘着剤等の適宜な接着手段を用いることができる。
【００２９】
本発明で用いる偏光板は特に限定されないが、その基本的な構成は、二色性物質含有のポリビニルアルコール系偏光フィルム等からなる偏光子の片側又は両側に、適宜の接着層、例えばビニルアルコール系ポリマー等からなる接着層を介して、保護層となる透明保護フィルムを接着したものからなる。
【００３０】
偏光子（偏光フィルム）としては、例えばポリビニルアルコールや部分ホルマール化ポリビニルアルコールなどのビニルアルコール系ポリマーよりなるフィルムに、ヨウ素や二色性染料等よりなる二色性物質による染色処理や延伸処理や架橋処理等の適宜な処理を適宜な順序や方式で施してなり、自然光を入射させると直線偏光を透過する適宜なものを用いることができる。特に、光透過率や偏光度に優れるものが好ましい。
【００３１】
偏光子（偏光フィルム）の片側又は両側に設ける透明保護層となる保護フィルム素材としては、適宜な透明フィルムを用いることができる。そのポリマーの例としてトリアセチルセルロースの如きアセテート系樹脂が一般的に用いられるが、これに限定されるものではない。
【００３２】
半透過型偏光板は、通常液晶セルの裏側に設けられ、液晶表示装置などを比較的明るい雰囲気で使用する場合には、視認側（表示側）からの入射光を反射させて画像を表示し、比較的暗い雰囲気においては、半透過型偏光板のバックサイドに内蔵されているバックライト等の内蔵光源を使用して画像を表示するタイプの液晶表示装置などを形成できる。すなわち、半透過型偏光板は、明るい雰囲気下では、バックライト等の光源使用のエネルギーを節約でき、比較的暗い雰囲気下においても内蔵光源を用いて使用できるタイプの液晶表示装置などの形成に有用である。
【００３３】
また、反射型偏光板は、通常液晶セルの裏側に配置され、視認側（表示側）からの入射光を反射させて表示するタイプの液晶表示装置（反射型液晶表示装置）などを形成できる。すなわち、反射型偏光板は、バックライト等の光源の内蔵を省略でき、液晶表示装置の薄型化を図りやすいなどの利点を有する。
【００３４】
本発明の半透過型偏光板や反射型偏光板には、液晶セル等の部材と接着するための粘着層を設けることもできる。粘着層の形成に用いる粘着剤は、特に限定はなく、例えば、アクリル系、シリコーン系、ポリエステル系、ポリウレタン系、ポリエーテル系、ゴム系等の適宜なものを用いることができる。粘着層は必要に応じて必要な面に設ければよい。粘着層の厚さについても、特に限定はなく、通常１０〜３０μｍである。
【００３５】
なお、表面に露出する場合には、その粘着層を実用に供するまでの間、汚染防止等を目的に、セパレータ（離型フィルム）にてカバーすることが好ましい。セパレータは、適宜な薄葉体に、必要に応じシリコーン系、長鎖アルキル系、フッ素系、硫化モリブデン等の剥離剤をコートする方式などにより形成することができる。
【００３６】
また、本発明の液晶表示装置は、前記半透過型偏光板又は前記反射型偏光板を液晶セルの少なくとも片面に配置したものである。
【００３７】
この液晶表示装置は、偏光板を液晶セルの片側又は両側に配置してなる従来に準じた適宜な構造を有するものとして形成することができる。したがって、液晶表示装置を形成する液晶セルは任意であり、例えば薄膜トランジスタ型に代表されるアクティブマトリクス駆動型のもの、ツイストネマチック型やスーパーツイストネマチック型に代表される単純マトリクス駆動型のものなどの適宜なタイプの液晶セルを用いたものであってよい。
【００３８】
また、液晶表示装置の形成に際しては、例えばプリズムアレイシートやレンズアレイシート、光拡散板やバックライト等の適宜な部品を適宜な位置に１層又は２層以上配置することができる。
【００３９】
【実施例】
以下、実施例及び比較例を用いて本発明を更に具体的に説明するが、本発明はこれらの実施例のみに制限されるものではない。
【００４０】
（実施例１）
反射板（東洋アルミ製、商品名「アルペット５０」；アルミ箔厚さ１５μｍ、ＰＥＴ基材厚さ５０μｍ）の上に、導電性ポリマー系の静電防止剤（バイエル製、導電塗料「デトロン」）を塗布し、膜厚０．２μｍの静電防止層を形成した。この静電防止層の表面抵抗値は６×１０5Ωであった。これに、厚み２５μｍの粘着剤を介して偏光板（日東電工(株)製、商品名「Ｆ１２０５」）を貼り合わせ、反射型偏光板を得た。また、偏光板に設けた粘着剤層を実用に供するまでの間、離型フィルムにてカバーした。この反射型偏光板の断面構成を図３に模式的に示したが、この構成では、アルミ箔は粘着剤とＰＥＴ基材に挟まれて絶縁された状態である。
【００４１】
上記の反射型偏光板について、静電防止層のＰＥＴ基材への密着力（剥離強度）を、万能引張試験機・テンシロンを用いて剥離速度０．３ｍ／ｍｉｎで１８０度ピール試験を行い測定したところ、２．４Ｎ／２５ｍｍであった。
【００４２】
次いで、本実施例のロール品を金属ロールを介して巻きだしたところ、帯電量は５００Ｖに止まった。
【００４３】
（実施例２）
銀蒸着半透過反射板（透過率１０％、反射率７０％、ＰＥＴ基材の厚み５０μｍ）に、導電性フィラー（ＳｎＯ2）分散型導電塗料（触媒化成(株)製、商品名「Ｐ３００１」）を塗布し、膜厚１μｍ、光透過率８０％の静電防止層を形成した。この静電防止層の表面抵抗値は１０×１０6Ωであった。これに、厚み２５μｍの粘着剤を介して偏光板（日東電工(株)製、商品名「Ｆ１２０５」）を貼り合わせ、半透過型偏光板を得た。なお、この構成では、銀蒸着膜は粘着剤とＰＥＴ基材に挟まれて絶縁された状態である。
【００４４】
上記静電防止層について、実施例１と同様にして、１８０度ピール試験により基材への密着力（剥離強度）を測定したところ、２Ｎ／２５ｍｍ以上であった。
【００４５】
次いで、本実施例のロール品を金属ロールを介して巻きだしたところ、帯電量は５００Ｖに止まった。
【００４６】
また、上記で得た半透過型偏光板に、再剥離性粘着剤付保護シート（日東電工(株)製、「ＳＰＶ−ＰＰＦ１００Ｔ」）を貼り合わせ、オートクレーブ処理（５０℃、５×１０5Ｐａ、２０分）した後に剥離したところ、静電防止層の脱落は発生しなかった。
【００４７】
（実施例３）
銀蒸着半透過反射板（透過率１０％、反射率７０％、ＰＥＴ基材の厚み５０μｍ）に、導電性フィラー分散型導電塗料（神東塗料(株)製、商品名「シントロン Ｄ６００」）を塗布し、膜厚２０μｍ、光透過率７０％の静電防止層を形成した。この静電防止層の表面抵抗値は１０×１０10Ωであった。これに、厚み２５μｍの粘着剤を介して偏光板（日東電工(株)製、商品名「Ｆ１２０５」）を貼り合わせ、半透過型偏光板を得た。なお、この構成では、銀蒸着膜は粘着剤とＰＥＴ基材に挟まれて絶縁された状態である。
【００４８】
上記静電防止層について、実施例１と同様にして、１８０度ピール試験により基材への密着力（剥離強度）を測定したところ、２Ｎ／２５ｍｍ以上であった。
【００４９】
次いで、本実施例のロール品を金属ロールを介して巻きだしたところ、帯電量は５００Ｖに止まった。
【００５０】
上記で得た半透過型偏光板に、再剥離性粘着剤付保護シート（日東電工(株)製、「ＳＰＶ−ＰＰＦ１００Ｔ」）を貼り合わせ、オートクレーブ処理（５０℃、５×１０5Ｐａ、２０分）した後に剥離したところ、静電防止層の脱落は発生しなかった。
【００５１】
（実施例４）
銀蒸着半透過反射板（透過率１０％、反射率７０％、ＰＥＴ基材の厚み５０μｍ）に、ケン化による易接着処理を行った。これにポリアニリン（導電性ポリマー、バインダー樹脂１０ｗｔ％含有）を塗布し、膜厚０．１μｍ、光透過率８０％の静電防止層を形成した。この表面抵抗値は１０×１０10Ωであった。これに、厚み２５μｍの粘着剤を介して偏光板（日東電工(株)製、商品名「Ｆ１２０５」）を貼り合わせ、半透過型偏光板を得た。なお、この構成では、銀蒸着膜は粘着剤とＰＥＴ基材に挟まれて絶縁された状態である。
【００５２】
上記静電防止層について、実施例１と同様にして、１８０度ピール試験により基材への密着力（剥離強度）を測定したところ、２Ｎ／２５ｍｍ以上であった。
【００５３】
次いで、本実施例のロール品を金属ロールを介して巻きだしたところ、帯電量は５００Ｖに止まった。
【００５４】
上記で得た半透過型偏光板に、再剥離性粘着剤付保護シート（日東電工(株)製、「ＳＰＶ−ＰＰＦ１００Ｔ」）を貼り合わせ、オートクレーブ処理（５０℃、５×１０5Ｐａ、２０分）した後に剥離したところ、静電防止層の脱落は発生しなかった。
【００５５】
実施例１〜実施例４に示す本発明品においては、図３に示すように、アルミ箔又は銀蒸着膜３は、粘着剤４とＰＥＴ基材１に挟まれて絶縁された状態であるにもかかわらず、帯電量が少ないことがわかる。これは、基材が帯電した場合でも表面のアースされた箇所へ電荷が移動し、静電気を除去できるためと考えられる。また、徐々に電荷が逃げ出すので火花が飛びにくい。
【００５６】
（比較例１）
反射板（東洋アルミ製、商品名「アルペット５０」；アルミ箔厚さ１５μｍ、ＰＥＴ基材厚さ５０μｍ）の上に、厚み２５μｍの粘着剤を介して偏光板（日東電工(株)製、商品名「Ｆ１２０５」）を貼り合わせ、反射型偏光板を得た。また、偏光板に設けた粘着剤層を実用に供するまでの間、離型フィルムにてカバーした。この反射型偏光板の断面構成を図４に模式的に示したが、この構成では、アルミ箔は粘着剤とＰＥＴ基材に挟まれて絶縁された状態である。
【００５７】
次いで、本実施例のロール品を金属ロールを介して巻きだしたところ、帯電量は１０００Ｖ以上に達した。
【００５８】
（比較例２）
反射板（東洋アルミ製、商品名「アルペット５０」；アルミ箔厚さ１５μｍ、ＰＥＴ基材厚さ５０μｍ）の上に、厚み２５μｍの粘着剤を介して偏光板（日東電工(株)製、商品名「Ｆ１２０５」）を貼り合わせた。このＰＥＴ基材の背面に、界面活性剤系静電防止剤（住友化学（株）製、「ＳＢ−８」）をスプレーした。処理後の表面の電気抵抗は１０×１０10Ω程度で、十分な静電気防止効果を有していたが、背面傷防止目的として、再剥離性粘着剤付保護シート（日東電工(株)製、「ＳＰＶ−ＰＰＦ１００Ｔ」）を貼り合わせ、剥離したところ、静電防止剤がＳＰＶ粘着剤によって剥落し、静電気防止効果が失われた。
【００５９】
比較例１〜比較例２に示す反射型偏光板においては、図４に示すように、アルミ箔１３は、粘着剤１４とＰＥＴ基材１１に挟まれて絶縁された状態であり、基材が帯電した場合、ＰＥＴフィルムとアルミ箔の間でコンデンサとなるため、静電気が基材表面を移動し難く逃げ出し難いと考えられる。また、アースした場合でも、アースした箇所だけ静電気を除去できるに留まり、それ以外の箇所には静電気が残る。さらに、アルミ箔をアースすると静電気は除去できるものの、電荷移動が早すぎるため一気に大電流が流れて火花が飛ぶ現象が起きる。
【００６０】
【発明の効果】
以上説明したとおり、本発明によれば、半透過型反射層又は反射層を積層した光透過性高分子基材の背面に静電防止層を形成したため、静電気が蓄積されず、静電気による火災や電気障害のおそれのない半透過型偏光板又は反射型偏光板を提供することができる。また、ＳＰＶが貼り合わされ、剥離された場合でも、静電防止層が脱落しないので、液晶表示装置に実装する場合等に有効である。
【図面の簡単な説明】
【図１】本発明の半透過型偏光板に含まれる半透過反射板（反射板）の構成例を示す模式断面図である。
【図２】従来の半透過反射板の構成例を示す模式断面図である。
【図３】本発明の反射型偏光板（半透過型偏光板）の構成例を示す模式断面図である。
【図４】比較例の反射型偏光板の構成例を示す模式断面図である。
【符号の説明】
１ 光透過性高分子基材
２ 静電防止層（導電層）
３ 半透過反射層（反射層）
４ 粘着剤層
５ 半透過反射板（反射板）
６ 偏光板
７ 離型フィルム
８ 半透過型偏光板（反射型偏光板）
９ アース
１１ 光透過性高分子基材
１３ 半透過反射層
１４ 粘着剤層
１５ 半透過反射板
１６ 偏光板
１７ 離型フィルム
１８ 反射型偏光板
１９ アース[0001]
[Technical field to which the invention belongs]
The present invention relates to a transflective polarizing plate, a reflective polarizing plate, and a liquid crystal display device using the same used in a liquid crystal display device (hereinafter sometimes abbreviated as “LCD”).
[0002]
[Prior art]
LCDs are used in desktop electronic calculators, electronic watches, personal computers, word processors, and the like, and their demand is rapidly increasing in recent years, and transflective displays such as mobile phones and personal portable information terminals are growing rapidly.
[0003]
Conventionally, in order to improve the display characteristics of an LCD, a transflective polarizing plate in which a transflective plate is laminated on a polarizing plate is usually provided on the back side of a liquid crystal cell, and the liquid crystal display device is used in a relatively bright atmosphere. In some cases, incident light from the viewing side (display side) is reflected to display an image. When used in a relatively dark atmosphere, a backlight built in the back side of the transflective polarizing plate, etc. A method of displaying an image using a built-in light source is employed. That is, the transflective polarizing plate is useful for forming a liquid crystal display device because it can save energy for using a light source such as a backlight in a bright atmosphere and can be used with a built-in light source in a relatively dark atmosphere.
[0004]
[Problems to be solved by the invention]
However, the reflecting plate is bonded to a resin substrate or formed by vapor deposition / sputtering, and is used by bonding to an optical film such as a polarizing plate. FIG. 2 is a schematic cross-sectional view showing a configuration example of a conventional transflective reflector or reflector. On the light transmitting polymer substrate 11 made of resin (insulating material) such as PET, it has in the semi-transmissive reflective layer of metal thin film is formed reflective layer (conductor) 13, an adhesive over the layer A layer (insulator) 14 is formed to constitute a transflective plate or reflector 15. For this reason, the structure sandwiched with the insulators easily holds static electricity, and there is a risk of causing a fire or an electrical failure due to static electricity. In addition, due to the nature of the product, a “removable protective sheet with adhesive” (hereinafter abbreviated as “SPV”) is often attached to the back side substrate to prevent scratches. If only the activator is applied, there is a problem that the surfactant can be removed when the SPV is bonded and peeled off.
[0005]
Accordingly, the present invention, the order to solve the conventional problems, hardly taken during bonding and peeling of the SPV, a transflective type polarizing plate occurrence of that for static electricity is maintained difficult electrical failure can be prevented, the reflective polarizer and their An object of the present invention is to provide a liquid crystal display device using the.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a transflective polarizing plate of the present invention comprises a polarizing plate, an adhesive layer, a translucent reflective layer comprising a light-transmitting metal vapor-deposited film or metal thin film, and a light-transmitting polymer. A base material and an antistatic layer having a surface resistance value of 10 × 10 10 Ω or less are laminated in this order .
[0007]
In the transflective polarizing plate of the present invention, the antistatic layer is preferably formed of a conductive polymer.
[0008]
In the transflective polarizing plate of the present invention, the antistatic layer is preferably formed from a resin binder to which a conductive filler is added.
[0009]
In the transflective polarizing plate of the present invention, the antistatic layer preferably has a peel strength of 0.5 N / 25 mm or more.
[0010]
In the transflective polarizing plate of the present invention, it is preferable that the light transmittance of the antistatic layer is 70% or more.
[0011]
In the transflective polarizing plate of the present invention, the light transmissive polymer base material is preferably formed from polyethylene terephthalate.
[0012]
Next, the reflective polarizing plate of the present invention has a polarizing plate, an adhesive layer, a reflective layer made of a metal vapor-deposited film or a metal thin film, a light-transmitting polymer substrate, and a surface resistance value of 10 × 10 10. An antistatic layer having a resistance of Ω or less is laminated in this order.
[0013]
In the reflective polarizing plate of the present invention, the antistatic layer is preferably formed of a conductive polymer.
[0014]
Moreover, in the reflective polarizing plate of this invention, it is preferable that the said antistatic layer is formed from the resin binder which added the conductive filler.
[0015]
Moreover, in the reflective polarizing plate of this invention, it is preferable that the peeling strength of the said antistatic layer is 0.5 N / 25mm or more.
[0016]
In the reflective polarizing plate of the present invention, the light-transmitting polymer base material is preferably formed from polyethylene terephthalate.
[0017]
The liquid crystal display device of the present invention is characterized in that the transflective polarizing plate or the reflective polarizing plate is disposed on at least one surface of a liquid crystal cell. In this liquid crystal display device, the transflective polarizing plate or the reflective polarizing plate has an antistatic layer formed on the transflective polarizing plate or the reflective polarizing plate on the display back side of the liquid crystal display device. It is preferable that they are arranged as described above.
[0018]
Further, the present invention is a method for producing the transflective polarizing plate of the present invention,
The manufacturing method prepares a laminate of a light-transmitting metal vapor-deposited film or a translucent reflective layer made of a metal thin film, and a light-transmitting polymer substrate,
An antistatic layer is formed by applying a conductive paint containing a conductive polymer or a conductive filler having a surface resistance value of 10 × 10 10 Ω or less on the light-transmitting polymer substrate of the laminate. And
An adhesive is applied on the transflective layer of the laminate to form an adhesive layer,
The method includes a step of laminating a polarizing plate on the pressure-sensitive adhesive layer to obtain a transflective polarizing plate.
[0019]
Further, the present invention is a method for producing the reflective polarizing plate of the present invention,
The manufacturing method prepares a laminated body of a reflective layer composed of a metal vapor-deposited film or a metal thin film and a light-transmitting polymer base material,
An antistatic layer is formed by applying a conductive paint containing a conductive polymer or a conductive filler having a surface resistance value of 10 × 10 10 Ω or less on the light-transmitting polymer substrate of the laminate. And
An adhesive is applied on the reflective layer of the laminate to form an adhesive layer,
The method includes a step of laminating a polarizing plate on the pressure-sensitive adhesive layer to obtain a reflective polarizing plate.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The transflective polarizing plate or reflective polarizing plate of the present invention includes a polarizing plate, an adhesive layer, a transflective layer comprising a light-transmitting metal vapor-deposited film or metal thin film, and a light-transmitting polymer substrate. And an antistatic layer having a surface resistance value of 10 × 10 10 Ω or less laminated in this order, or a polarizing plate, an adhesive layer, a reflective layer made of a metal vapor-deposited film or a metal thin film, A light-transmitting polymer base material and an antistatic layer having a surface resistance value of 10 × 10 10 Ω or less are laminated in this order. When the surface resistance value is larger than 10 × 10 10 Ω, static electricity is likely to be accumulated on the reflector, which may cause a fire or electrical failure due to static electricity, which is not preferable. The surface resistance value is preferably 10 × 10 8 Ω or less, more preferably 10 × 10 7 Ω or less.
[0021]
As the light-transmitting polymer substrate, resins such as polyethylene terephthalate (PET), polycarbonate (PC), polyethersulfone (PES), polyvinyl alcohol (PVA), and triacetyl cellulose (TAC) can be used. The thickness is not particularly limited, but is usually 6 to 100 μm.
[0022]
The semi-transmissive reflective layer or the reflective layer is formed from a metal vapor deposition film or a metal thin film. Examples of the metal that can be used for the metal vapor deposition film and the metal thin film include aluminum, silver, a silver-palladium alloy, and chromium.
[0023]
The antistatic layer is not particularly limited as long as the antistatic layer satisfies the above-mentioned characteristics, but in order to prevent dropping at the time of SPV laminating or peeling, a resin binder to which a conductive polymer or a conductive filler is added. It is preferable that a conductive layer made of is formed. In the transflective plate, the antistatic layer preferably has a light transmittance of 70% or more, and more preferably 80% or more. Although the thickness of an antistatic layer is not specifically limited, Usually, it is 0.1-50 micrometers.
[0024]
The conductive polymer is not particularly limited, and all conventionally known conductive polymers such as polyaniline, polyacetylene, and various doping materials obtained by ion doping these polymers can be used. Examples of the conductive filler include indium oxide, tin oxide, zinc oxide and ATO (antimony tin oxide).
[0025]
The method for forming the antistatic layer is not particularly limited. For example, the antistatic layer is formed by applying a conductive paint containing a conductive polymer or a conductive filler to a light-transmitting polymer substrate and drying it. be able to. A commercially available conductive paint can also be used.
[0026]
In addition, the antistatic layer is used when the EL backlight, the diffusing member, and the prism sheet are directly attached to the back side, and the adhesion to the light-transmitting polymer substrate is expressed as the peel strength. The value is 0.5 N / 25 mm or more, preferably 2 N / 25 mm or more, more preferably 5 N / 25 mm or more.
[0027]
FIG. 1 shows a configuration example of a transflective plate (or a reflective plate) included in the transflective polarizing plate of the present invention. A semi-transmissive reflective layer (or reflective layer) 3 is formed on the light transmissive polymer substrate 1, and an adhesive layer 4 is formed thereon. The layer 2 is formed to constitute a transflective reflector (or reflector) 5. When this is mounted on a display device, the anti-static layer of the transflective reflector (or reflector) 5 is provided so that when charged, the charges can move smoothly to the ground and the static electricity can be easily removed. Arrange it so that it is on the display back side.
[0028]
The transflective polarizing plate of the present invention is a laminate of the transflective plate and the polarizing plate, and the reflective polarizing plate is a laminate of the reflector and the polarizing plate. In addition, suitable adhesion means, such as an adhesive, can be used for bonding.
[0029]
The polarizing plate used in the present invention is not particularly limited, but the basic constitution thereof is an appropriate adhesive layer such as a vinyl alcohol type on one or both sides of a polarizer made of a dichroic substance-containing polyvinyl alcohol polarizing film or the like. It consists of what adhered the transparent protective film used as a protective layer through the adhesive layer which consists of polymers etc.
[0030]
As a polarizer (polarizing film), for example, a film made of a vinyl alcohol polymer such as polyvinyl alcohol or partially formalized polyvinyl alcohol, a dyeing process or a stretching process or a crosslinking with a dichroic substance such as iodine or a dichroic dye. Appropriate processing such as processing can be performed in an appropriate order and method, and an appropriate material that transmits linearly polarized light when natural light is incident can be used. In particular, those excellent in light transmittance and degree of polarization are preferable.
[0031]
An appropriate transparent film can be used as a protective film material to be a transparent protective layer provided on one side or both sides of a polarizer (polarizing film). As an example of the polymer, an acetate-based resin such as triacetyl cellulose is generally used, but is not limited thereto.
[0032]
A transflective polarizing plate is usually provided on the back side of a liquid crystal cell, and displays an image by reflecting incident light from the viewing side (display side) when a liquid crystal display device is used in a relatively bright atmosphere. In a relatively dark atmosphere, a liquid crystal display device or the like that displays an image using a built-in light source such as a backlight built in the back side of the transflective polarizing plate can be formed. In other words, the transflective polarizing plate is useful for forming a liquid crystal display device of a type that can save energy of using a light source such as a backlight in a bright atmosphere and can be used with a built-in light source even in a relatively dark atmosphere. It is.
[0033]
The reflective polarizing plate is usually disposed on the back side of the liquid crystal cell, and can form a liquid crystal display device (reflective liquid crystal display device) or the like of a type that reflects incident light from the viewing side (display side). In other words, the reflective polarizing plate has advantages such that the incorporation of a light source such as a backlight can be omitted and the liquid crystal display device can be easily thinned.
[0034]
The transflective polarizing plate and reflective polarizing plate of the present invention can be provided with an adhesive layer for adhering to a member such as a liquid crystal cell. The pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer is not particularly limited, and for example, an appropriate material such as acrylic, silicone, polyester, polyurethane, polyether, or rubber can be used. What is necessary is just to provide an adhesion layer in a required surface as needed. There is no limitation in particular also about the thickness of an adhesion layer, and it is 10-30 micrometers normally.
[0035]
In addition, when exposed on the surface, it is preferable to cover with the separator (release film) for the purpose of contamination prevention etc. until the adhesion layer is put to practical use. The separator can be formed by a method in which an appropriate thin leaf is coated with a release agent such as silicone, long-chain alkyl, fluorine, or molybdenum sulfide as necessary.
[0036]
In the liquid crystal display device of the present invention, the transflective polarizing plate or the reflective polarizing plate is disposed on at least one surface of a liquid crystal cell.
[0037]
This liquid crystal display device can be formed as having an appropriate structure according to the prior art in which polarizing plates are arranged on one side or both sides of a liquid crystal cell. Accordingly, the liquid crystal cell forming the liquid crystal display device is arbitrary. For example, an active matrix driving type typified by a thin film transistor type, a simple matrix driving type typified by a twist nematic type or a super twist nematic type, etc. Any type of liquid crystal cell may be used.
[0038]
In forming the liquid crystal display device, for example, appropriate components such as a prism array sheet, a lens array sheet, a light diffusion plate, and a backlight can be arranged in one or more layers at appropriate positions.
[0039]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to only these Examples.
[0040]
Example 1
On a reflector (product of Toyo Aluminum, trade name “Alpet 50”; aluminum foil thickness 15 μm, PET substrate thickness 50 μm), conductive polymer antistatic agent (manufactured by Bayer, conductive paint “Detron”) ) Was applied to form an antistatic layer having a thickness of 0.2 μm. The surface resistance value of this antistatic layer was 6 × 10 5 Ω. A polarizing plate (manufactured by Nitto Denko Corporation, trade name “F1205”) was bonded to this with a 25 μm thick adhesive to obtain a reflective polarizing plate. The adhesive layer provided on the polarizing plate was covered with a release film until it was practically used. FIG. 3 schematically shows a cross-sectional configuration of the reflective polarizing plate. In this configuration, the aluminum foil is insulatively sandwiched between an adhesive and a PET base material.
[0041]
About the reflection type polarizing plate, the adhesion strength (peeling strength) of the antistatic layer to the PET substrate was measured by performing a 180 degree peel test at a peeling speed of 0.3 m / min using a universal tensile tester / Tensilon. As a result, it was 2.4 N / 25 mm.
[0042]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0043]
(Example 2)
Conductive filler (SnO 2 ) -dispersed conductive paint (trade name “P3001”, manufactured by Catalyst Chemical Co., Ltd.) on a silver-deposited transflective reflector (transmittance 10%, reflectivity 70%, PET substrate thickness 50 μm) ) To form an antistatic layer having a thickness of 1 μm and a light transmittance of 80%. The surface resistance value of this antistatic layer was 10 × 10 6 Ω. A polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “F1205”) was bonded to this with an adhesive having a thickness of 25 μm to obtain a transflective polarizing plate. In this configuration, the silver deposited film is insulatively sandwiched between the adhesive and the PET base material.
[0044]
About the said antistatic layer, when it carried out similarly to Example 1 and measured the adhesive force (peeling strength) to a base material by a 180 degree | times peel test, it was 2 N / 25mm or more.
[0045]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0046]
In addition, a protective sheet with a releasable pressure-sensitive adhesive (manufactured by Nitto Denko Corporation, “SPV-PPF100T”) is bonded to the transflective polarizing plate obtained above and autoclaved (50 ° C., 5 × 10 5 Pa, 20 And the antistatic layer did not fall off.
[0047]
Example 3
Conductive filler-dispersed conductive paint (trade name “Syntron D600”, manufactured by Shinto Paint Co., Ltd.) is applied to a silver-deposited transflective reflector (transmittance 10%, reflectivity 70%, PET substrate thickness 50 μm). This was applied to form an antistatic layer having a thickness of 20 μm and a light transmittance of 70%. The surface resistance value of this antistatic layer was 10 × 10 10 Ω. A polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “F1205”) was bonded to this with an adhesive having a thickness of 25 μm to obtain a transflective polarizing plate. In this configuration, the silver deposited film is insulatively sandwiched between the adhesive and the PET base material.
[0048]
About the said antistatic layer, when it carried out similarly to Example 1 and measured the adhesive force (peeling strength) to a base material by a 180 degree | times peel test, it was 2 N / 25mm or more.
[0049]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0050]
A protective sheet with a releasable pressure-sensitive adhesive (“SPV-PPF100T” manufactured by Nitto Denko Corporation) is bonded to the transflective polarizing plate obtained above and autoclaved (50 ° C., 5 × 10 5 Pa, 20 And the antistatic layer did not fall off.
[0051]
Example 4
An easy adhesion treatment by saponification was performed on a silver-deposited transflective reflector (transmittance 10%, reflectivity 70%, PET base material thickness 50 μm). Polyaniline (conducting polymer, containing 10% by weight of binder resin) was applied thereto to form an antistatic layer having a thickness of 0.1 μm and a light transmittance of 80%. The surface resistance value was 10 × 10 10 Ω. A polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “F1205”) was bonded to this with an adhesive having a thickness of 25 μm to obtain a transflective polarizing plate. In this configuration, the silver deposited film is insulatively sandwiched between the adhesive and the PET base material.
[0052]
About the said antistatic layer, when it carried out similarly to Example 1 and measured the adhesive force (peeling strength) to a base material by a 180 degree | times peel test, it was 2 N / 25mm or more.
[0053]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0054]
A protective sheet with a releasable pressure-sensitive adhesive (“SPV-PPF100T” manufactured by Nitto Denko Corporation) is bonded to the transflective polarizing plate obtained above and autoclaved (50 ° C., 5 × 10 5 Pa, 20 And the antistatic layer did not fall off.
[0055]
In the present invention products shown in Examples 1 to 4, as shown in FIG. 3, the aluminum foil or the silver deposited film 3 is sandwiched between the pressure-sensitive adhesive 4 and the PET substrate 1 and insulated. Nevertheless, it can be seen that the amount of charge is small. This is presumably because, even when the substrate is charged, the charge moves to the grounded portion of the surface, and the static electricity can be removed. Also, since the electric charge gradually escapes, it is difficult for the spark to fly.
[0056]
(Comparative Example 1)
A polarizing plate (manufactured by Nitto Denko Co., Ltd.) on a reflector (made by Toyo Aluminum Co., Ltd., trade name “Alpet 50”; aluminum foil thickness 15 μm, PET substrate thickness 50 μm) with a 25 μm thick adhesive. The product name “F1205”) was bonded to obtain a reflective polarizing plate. The adhesive layer provided on the polarizing plate was covered with a release film until it was practically used. FIG. 4 schematically shows a cross-sectional configuration of the reflective polarizing plate. In this configuration, the aluminum foil is insulatively sandwiched between an adhesive and a PET base material.
[0057]
Next, when the roll product of this example was unwound through a metal roll, the charge amount reached 1000 V or more.
[0058]
(Comparative Example 2)
A polarizing plate (manufactured by Nitto Denko Co., Ltd.) on a reflector (made by Toyo Aluminum Co., Ltd., trade name “Alpet 50”; aluminum foil thickness 15 μm, PET substrate thickness 50 μm) with a 25 μm thick adhesive. The product name “F1205”) was pasted. A surfactant-based antistatic agent (manufactured by Sumitomo Chemical Co., Ltd., “SB-8”) was sprayed on the back surface of the PET substrate. The surface electrical resistance after the treatment was about 10 × 10 10 Ω and had a sufficient antistatic effect, but for the purpose of preventing scratches on the back surface, a protective sheet with a releasable adhesive (manufactured by Nitto Denko Corporation, When “SPV-PPF100T”) was bonded and peeled off, the antistatic agent was peeled off by the SPV adhesive and the antistatic effect was lost.
[0059]
In the reflective polarizing plates shown in Comparative Examples 1 and 2, as shown in FIG. 4, the aluminum foil 13 is in an insulated state sandwiched between the adhesive 14 and the PET base material 11, and the base material is When charged, it becomes a capacitor between the PET film and the aluminum foil, so that it is difficult for static electricity to move on the surface of the substrate and to escape. In addition, even when grounding, static electricity can be removed only at the grounded location, and static electricity remains at other locations. In addition, grounding the aluminum foil can remove static electricity, but the charge transfer is too fast, causing a large current to flow at once and sparks to fly.
[0060]
【The invention's effect】
As described above, according to the present invention, since the antistatic layer is formed on the back surface of the translucent reflective base material or the light transmissive polymer base material on which the reflective layer is laminated, static electricity is not accumulated, It is possible to provide a transflective polarizing plate or a reflective polarizing plate that does not cause an electrical failure. Further, even when SPV is bonded and peeled off, the antistatic layer does not fall off, which is effective when mounted on a liquid crystal display device.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a configuration example of a transflective plate (reflective plate) included in a transflective polarizing plate of the present invention.
FIG. 2 is a schematic cross-sectional view showing a configuration example of a conventional transflective plate.
FIG. 3 is a schematic cross-sectional view showing a configuration example of a reflective polarizing plate (semi-transmissive polarizing plate) of the present invention.
FIG. 4 is a schematic cross-sectional view showing a configuration example of a reflective polarizing plate of a comparative example.
[Explanation of symbols]
1 Light-transmissive polymer substrate 2 Antistatic layer (conductive layer)
3 Transflective layer (reflective layer)
4 Adhesive layer 5 Transflective reflector (reflector)
6 Polarizing plate 7 Release film 8 Transflective polarizing plate (Reflective polarizing plate)
DESCRIPTION OF SYMBOLS 9 Ground 11 Light transmissive polymer base material 13 Semi-transmissive reflective layer 14 Adhesive layer 15 Semi-transmissive reflective plate 16 Polarizing plate 17 Release film 18 Reflective polarizing plate 19 Ground

Claims (14)

偏光板と、粘着剤層と、光透過性を有する金属蒸着膜又は金属薄膜からなる半透過反射層と、光透過性高分子基材と、表面抵抗値が１０×１０  A polarizing plate, an adhesive layer, a translucent reflective layer made of a light-transmitting metal vapor-deposited film or metal thin film, a light-transmitting polymer substrate, and a surface resistance value of 10 × 10 10Ten Ω以下である静電防止層とをこの順番で積層したことを特徴とする半透過型偏光板。A transflective polarizing plate characterized by laminating an antistatic layer of Ω or less in this order. 前記静電防止層が、導電性ポリマーから形成されてなる請求項１に記載の半透過型偏光板。The transflective polarizing plate according to claim 1, wherein the antistatic layer is formed of a conductive polymer. 前記静電防止層が、導電性フィラーを添加した樹脂バインダーから形成されてなる請求項１に記載の半透過型偏光板。The transflective polarizing plate according to claim 1, wherein the antistatic layer is formed from a resin binder to which a conductive filler is added. 前記静電防止層の剥離強度が、０．５Ｎ／２５ｍｍ以上である請求項１〜３のいずれかに記載の半透過型偏光板。The transflective polarizing plate according to claim 1, wherein the antistatic layer has a peel strength of 0.5 N / 25 mm or more. 前記静電防止層の光透過率が、７０％以上である請求項１〜４のいずれかに記載の半透過型偏光板。The transflective polarizing plate according to claim 1, wherein the antistatic layer has a light transmittance of 70% or more. 前記光透過性高分子基材が、ポリエチレンテレフタレートから形成される請求項１〜５のいずれかに記載の半透過型偏光板。  The transflective polarizing plate according to any one of claims 1 to 5, wherein the light transmissive polymer substrate is formed from polyethylene terephthalate. 偏光板と、粘着剤層と、金属蒸着膜又は金属薄膜からなる反射層と、光透過性高分子基材と、表面抵抗値が１０×１０  A polarizing plate, an adhesive layer, a reflective layer made of a metal vapor-deposited film or a metal thin film, a light-transmitting polymer substrate, and a surface resistance value of 10 × 10 10Ten Ω以下である静電防止層とをこの順番で積層したことを特徴とする反射型偏光板。A reflection type polarizing plate characterized by laminating an antistatic layer of Ω or less in this order. 前記静電防止層が、導電性ポリマーから形成されてなる請求項７に記載の反射型偏光板。The reflective polarizing plate according to claim 7, wherein the antistatic layer is formed of a conductive polymer. 前記静電防止層が、導電性フィラーを添加した樹脂バインダーから形成されてなる請求項７に記載の反射型偏光板。The reflective polarizing plate according to claim 7, wherein the antistatic layer is formed from a resin binder to which a conductive filler is added. 前記静電防止層の剥離強度が、０．５Ｎ／２５ｍｍ以上である請求項７〜９のいずれかに記載の反射型偏光板。The reflective polarizing plate according to claim 7, wherein the antistatic layer has a peel strength of 0.5 N / 25 mm or more. 前記光透過性高分子基材が、ポリエチレンテレフタレートから形成される請求項７〜１０のいずれかに記載の反射過型偏光板。  The reflective over-type polarizing plate according to any one of claims 7 to 10, wherein the light-transmitting polymer substrate is formed from polyethylene terephthalate. 請求項１〜６のいずれかに記載の半透過型偏光板又は請求項７〜１１のいずれかに記載の反射型偏光板を、液晶セルの少なくとも片面に配置したことを特徴とする液晶表示装置。A liquid crystal display device comprising the transflective polarizing plate according to any one of claims 1 to 6 or the reflective polarizing plate according to any one of claims 7 to 11 arranged on at least one surface of a liquid crystal cell. . 請求項１に記載の半透過型偏光板の製造方法であって、It is a manufacturing method of the transflective polarizing plate according to claim 1,
前記製造方法が、光透過性を有する金属蒸着膜又は金属薄膜からなる半透過反射層と、光透過性高分子基材との積層体を準備し、  The manufacturing method prepares a laminate of a light-transmitting metal vapor-deposited film or a metal thin film and a light-transmitting polymer base material,
前記積層体の前記光透過性高分子基材上に、表面抵抗値が１０×１０  On the light-transmitting polymer base material of the laminate, the surface resistance value is 10 × 10 10Ten Ω以下である導電性ポリマーまたは導電性フィラーを含有する導電性塗料を塗布して静電防止層を形成し、Applying a conductive paint containing a conductive polymer or conductive filler that is Ω or less to form an antistatic layer,
前記積層体の前記半透過反射層上に粘着剤を塗布して粘着剤層を形成し、  An adhesive is applied on the transflective layer of the laminate to form an adhesive layer,
前記粘着剤層上に偏光板を積層して半透過型偏光板を得る工程を含む製造方法。  The manufacturing method including the process of laminating | stacking a polarizing plate on the said adhesive layer and obtaining a transflective polarizing plate. 請求項７に記載の反射型偏光板の製造方法であって、It is a manufacturing method of the reflective polarizing plate according to claim 7,
前記製造方法が、金属蒸着膜又は金属薄膜からなる反射層と、光透過性高分子基材との積層体を準備し、  The manufacturing method prepares a laminate of a reflective layer made of a metal vapor-deposited film or a metal thin film, and a light-transmitting polymer base material,
前記積層体の前記光透過性高分子基材上に、表面抵抗値が１０×１０  On the light-transmitting polymer base material of the laminate, the surface resistance value is 10 × 10 10Ten Ω以下である導電性ポリマーまたは導電性フィラーを含有する導電性塗料を塗布して静電防止層を形成し、An antistatic layer is formed by applying a conductive paint containing a conductive polymer or conductive filler that is Ω or less,
前記積層体の前記反射層上に粘着剤を塗布して粘着剤層を形成し、  Applying an adhesive on the reflective layer of the laminate to form an adhesive layer,
前記粘着剤層上に偏光板を積層して反射型偏光板を得る工程を含む製造方法。  A production method comprising a step of laminating a polarizing plate on the pressure-sensitive adhesive layer to obtain a reflective polarizing plate.
JP2002131517A 2001-09-26 2002-05-07 Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them Expired - Fee Related JP3894549B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2002131517A JP3894549B2 (en) 2001-09-26 2002-05-07 Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them
US10/253,436 US6965418B2 (en) 2001-09-26 2002-09-25 Semi-transmitting reflective plate, reflective plate, semi-transmitting polarizer, reflective polarizer and liquid crystal display using same
TW091122168A TW571125B (en) 2001-09-26 2002-09-26 Semi-transmitting reflective plate, reflective plate, semi-transmitting polarizer, reflective polarizer and liquid crystal display using same
CNB021434484A CN1281978C (en) 2001-09-26 2002-09-26 Semipermeable reflective plate and reflective plate and semipermeable polazied plate and reflective polazied plate and liquid crystal display
KR1020020058407A KR100841844B1 (en) 2001-09-26 2002-09-26 Semi-transmitting reflective plate, reflective plate, semi-transmitting polarizer, reflective polarizer and liquid crystal display using same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001-294930 2001-09-26
JP2001294930 2001-09-26
JP2002131517A JP3894549B2 (en) 2001-09-26 2002-05-07 Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them

Publications (2)

Publication Number Publication Date
JP2003172809A JP2003172809A (en) 2003-06-20
JP3894549B2 true JP3894549B2 (en) 2007-03-22

Family

ID=26622989

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002131517A Expired - Fee Related JP3894549B2 (en) 2001-09-26 2002-05-07 Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them

Country Status (5)

Country Link
US (1) US6965418B2 (en)
JP (1) JP3894549B2 (en)
KR (1) KR100841844B1 (en)
CN (1) CN1281978C (en)
TW (1) TW571125B (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100439949C (en) * 2003-03-31 2008-12-03 住友化学工业株式会社 Laminated polarizing film
JP3902186B2 (en) * 2003-04-21 2007-04-04 日東電工株式会社 Antistatic optical film, method for producing the same, and image display device
CN100361003C (en) * 2003-10-29 2008-01-09 铼宝科技股份有限公司 Double-faced display device
US7572490B2 (en) 2004-04-27 2009-08-11 Samsung Electronics Co., Ltd. Brightness enhancement film for liquid crystal display and manufacturing method thereof
US7279060B2 (en) * 2004-05-04 2007-10-09 Eastman Kodak Company Guarded cover film for LCD polarizers
KR20070043817A (en) * 2004-08-02 2007-04-25 후지필름 가부시키가이샤 Optical film, producing method therefor, polarizing plate and image display apparatus
US7087351B2 (en) * 2004-09-29 2006-08-08 Eastman Kodak Company Antistatic layer for electrically modulated display
JP4346087B2 (en) * 2004-10-21 2009-10-14 日東電工株式会社 Antistatic optical film, antistatic adhesive optical film, production method thereof and image display device
JP4714452B2 (en) * 2004-10-21 2011-06-29 日東電工株式会社 Antistatic adhesive optical film and image display device
KR20070002772A (en) * 2005-06-30 2007-01-05 삼성전자주식회사 Polarizer and liquid crystal display having the same
KR20070008864A (en) * 2005-07-12 2007-01-18 삼성전자주식회사 Liquid crystal display and method for manufacturing the same
US20090303481A1 (en) * 2005-12-20 2009-12-10 Nobuhiko Nakai Optical component, a front/back identifying method for the optical component, and a front/back identifying device for the optical component
KR20070096145A (en) * 2006-03-14 2007-10-02 광 석 서 Antistatic coating formulation for polarizer films and antistatic polarizer film using the same
US7644907B2 (en) * 2006-12-28 2010-01-12 Schlumberger Technology Corporation Drum for a well access line
CN102401921B (en) * 2010-09-13 2015-05-27 宏腾光电股份有限公司 High-shielding reflection film and manufacturing process thereof
KR20130045734A (en) * 2011-10-26 2013-05-06 삼성디스플레이 주식회사 Transparent display device
WO2019022050A1 (en) * 2017-07-25 2019-01-31 積水化学工業株式会社 Adhesive tape for semiconductor protection and method for processing semiconductor
CN109300395B (en) * 2018-10-12 2020-11-20 京东方科技集团股份有限公司 Color film substrate, preparation method thereof and quantum dot display device comprising color film substrate

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2790032B2 (en) * 1994-03-11 1998-08-27 松下電器産業株式会社 Transmission screen and manufacturing method thereof
JP3619915B2 (en) 1996-01-26 2005-02-16 コニカミノルタホールディングス株式会社 Protective film for polarizing plate and polarizing plate
JP3165100B2 (en) 1998-02-09 2001-05-14 日本電気株式会社 Liquid crystal display device and manufacturing method thereof
US6343865B1 (en) * 1998-02-17 2002-02-05 Dai Nippon Printing Co., Ltd. Non-glare film, polarizing device and display device
JPH11305040A (en) 1998-04-20 1999-11-05 Nitto Denko Corp Reflection type polarizing plate and semi-transmission type polarizing plate
US6372354B1 (en) * 1999-09-13 2002-04-16 Chemat Technology, Inc. Composition and method for a coating providing anti-reflective and anti-static properties
JP2001228305A (en) * 1999-12-06 2001-08-24 Sumitomo Chem Co Ltd Antireflection layer
JP2001235627A (en) * 2000-02-23 2001-08-31 Nitto Denko Corp Optical member
JP3560532B2 (en) * 2000-05-02 2004-09-02 株式会社巴川製紙所 Antistatic film for display
JP3545319B2 (en) * 2000-07-31 2004-07-21 株式会社巴川製紙所 Antistatic antireflection film

Also Published As

Publication number Publication date
CN1409130A (en) 2003-04-09
KR20030027747A (en) 2003-04-07
US20030058391A1 (en) 2003-03-27
KR100841844B1 (en) 2008-06-27
JP2003172809A (en) 2003-06-20
CN1281978C (en) 2006-10-25
US6965418B2 (en) 2005-11-15
TW571125B (en) 2004-01-11

Similar Documents

Publication Publication Date Title
JP3894549B2 (en) Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them
KR101501794B1 (en) Composite polarizing plate, laminated optical member, and image display device using them
KR102691680B1 (en) Laminate
JP5082480B2 (en) Thin polarizing plate and image display device using the same
US9720281B2 (en) Optical laminate for front surface of in-cell touch panel liquid crystal element and in-cell touch panel liquid crystal display device using same
JP2002019039A (en) Protective film for protecting surface of optical member
US20090068381A1 (en) Polarizing sheet
JP2002221715A (en) Liquid crystal display device and liquid crystal display using the same
JP2008197310A (en) Thin polarizing plate, composite polarizing plate, image display device, and method for manufacturing composite polarizing plate
KR20180028986A (en) Surface protection film, capacitive touch panel, and image display device
JP2000199819A (en) Polarizing plate, its manufacture, optical member and liquid crystal display device
JP4384300B2 (en) Touch panel and display device using the same
JP2003107221A (en) Translucent reflecting plate, translucent polarizing plate, and liquid crystal display device using the same
JP3373492B2 (en) Polarizer
JP2002236213A (en) Polarizing plate and liquid crystal display device which uses the same
JP4219735B2 (en) Low reflection touch panel mounting structure and low reflection touch panel mounting sheet
JP2002258052A (en) Polarizing plate integrated with optical compensation layer and liquid crystal display using the same
JP2003157149A (en) Touch panel having high durability
JP4132478B2 (en) Surface protective film, optical member, and liquid crystal display device
JP2004029367A (en) Optical members having excellent cutting workability and method of cutting
JP3038028B2 (en) Transparent touch panel
JP2000081513A (en) Optical member and liquid crystal display device
JP2001194528A (en) Polarizing plate
JP2002018997A (en) Protective film for protecting surface of optical member
JP2003149438A (en) Optical film and liquid crystal display device using the same

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20041108

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20060606

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060613

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060810

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20061207

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20061211

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

Ref document number: 3894549

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121222

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121222

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20151222

Year of fee payment: 9

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees